Question : How to force user to place 'ksh' before running a shell script

Here is the issue, I have written a ksh script that is to be run both Unix and Linux, since the script containts logic and features that only "korn" will give better/valid result, so what I want is:

whenever this program is excuted, make sure it will be running like below:

$ ksh myprog.sh

if user enter $ sh myprogram.sh
the program will prompt the use to enter "ksh myprogram.sh" instead.

Why I am asking for this,  so I don't need to care wheather the default shell for a give user is a bash/csh/

What I want is logic in "myprogram.sh" to check if user does enetr the ksh before the $0 !

Thank you,

David

Answer : How to force user to place 'ksh' before running a shell script

Change

ksh=$(set | grep  ksh)


to

ksh=`set | grep  ksh`